Extracting steam from steam-turbines.



I. E. NORTON. EXTRAGTING STEAM PRO-M STEAM TURBINES/ APPLICATION FILEDJAN.11, 1913 s sums-emu 1.

Stage Dr'essu re 0 To Condenser- Witnesses:

' Inventor. Fred E. Nor-ton,

bgm'

aqttg.

Peitent'ed Mar. 24, 1914 V RENORTON. BXTRAOTING STEAM FROM STEAMTURBINES. APPLICATION FILED JAN. 11, 1913.

1,091,078, Patented Mar. 24, 1914 a SHEETS-SHEET 2.

Fig.- 2. v

Inventor,

F'red E.Norton,

RB. NORTON. EXTBAGTING STEAM FROM STEAM TUBBINBS.

APPLICATION FILED JAN. 11, 1913.

1,091,078. Patented Mar.24, 1914;

a sums-5111:2123;

Fig. 3.

. W I 7%- IM & H \A Witnesses:

V F EInven tor: I red .No ton,

UNITED STATES...

FRED E. NORTON,

F LYNN, MASSACHUSETTS, Assisivon 'rofsn'itm gi. Eifid gfiic C NCOR-PORATIQN OF NEW R j A w ExTitAcEriivG STEAM- FROM STEAM-TURBINES.

Specification of Letters Patent. Pa'ten'ted M 'To (ill teli o'zn itjinay concern. a? v Be-1t known that I, FRED E. Nonrox, a citizen oftheUnited States, residing at Lynn,,count y of Essex, State ofMassachu-l setts, have invented certain new and useful Improvements inExtracting Steam from Steam-Turbines, of which the following aspecification. I

This inyention'relates to steam turbines from which steam is extractedfor industrial purposes after passing through one or more iigh pressurestages of said turbine. The amount of steam so extracted is liable tovary considerably from time to time, so that it is necessary to providemeans for regulating the flow of steam through the turbine in order tomaintain an approximately uniform pressure in the stage supplying theindustrial appliances. The present invention has especial reference tomechanism for effecting such regulation. It comprises a valve.

controlling the passage of steam from the extraction stage of theturbine to the next stage of lower pressure, a motorfor operating saidvalvej a movable abutment exposed on one side to the pressure of thesteam in the extraction stage and on the other side to 'low or condenserpressure; a spring opposing the movement. of said abutment, and a pilotvalve for the motor controlled by said movable abutment .VVhen thepressure in he extraction stage rises high enough to overcome thetension of the spring. the abut- .s ment moves and shifts thepilotivalve to ad- 35 mit fluidpressure to the motor,.wh ich opens thevalve between the stages andallows some of 1th-;'steam-to overflow intothe next stage. This ."reduces the abnormal pressure in the extractionstage; conversely, ii the extraction stage pressure drops too low, themotor will close the overflow valve and retain the steam in' theextraction stage which causes its pressure to rise. In this way, asubstan- --tially constant pressure is maintained in the extractionstage.

' -111- the accompanying drawings, Figure" 1 is a side elevation of oneend of a horizontal turbine equipped with my invention: Fig. 2 is an endvie\v,-partly broken away; Fig. 3 is a vertical section lengthwise ofthe .motor and its valve mechanism; Fig; 4 is a horizontal longitudinalsec- I tion'of the pilot valve on the line 4-4.-,

' 3; Fig. 5. isa longitudinal he on;

Ihaust pipe 22 tion of the turbine on the li'ne; and Fig. 6 is acrossese valve but ona larger, scale.

The turbine casing l-zhajSa eh Pre ure- Steam-chest 2 s he ii'sualfl ihp essure nozzle valves 2;, which 21; cont by suitablevalve gear.notnshoivn Tl as in has an outlet 3, Fig.2, fro ma highipres sure stage,preferably -the first, saidoutletil ing preferably cast integraljvithgsaid casi' g, in

and connected to a conduit QOn \,*,eying steam from said-stage to an.industrial appliance such as :a heating system, i M cooking device, orthe like. extracted through-.- the} I r H through'the lower stage 5-,,Fig. tiIlOf the tum. bine to'the condenser conduitfi i the main shaft 7are-;;mounte a v vheels 8 and 9; the turbine illustrated @b; ing a twostage machin The inventionsis applicable, however, toarbinenumber ofstages.- v V ;jr n 'An annular flatfaced ridironIvalvellIO controls theoverflow of st m froni stage to stage 5, and isrevoluble in"; rahbetedring 11 secured'to the ,-di' aph1 agni .hiQh 39 separates the two stagesand. up 'o s the nozzles 13 forFthe lower press re g. The overflow"valve is operatedijb -o 1;=14 ;1 med thereto, preferablyifby aj ban-and.socket joint- 15, Fig. 2. Theaojd 14 t ton'rod for a motor, is st of apiston 16, Fig. 3, 17 secured to a fiangelS Fluid pressure, preferabl Isteam chest2, is adniittedzto. he 1' by a" pilot valve operating; whichis preferably castgi-ntegri cylinder. The steam enters 1* Q the casingthrough a pipe :21v exhausts from the other is le througha 22 to thecondenser .condt A plug 23 fills the interior o the c; g It has in oneside a .poit 6. .4; ig. Mad

ting steam from the pipe=n212to3its interci- The opposite, side oftheip-luggisflattened at '25 for a portion of it-s-ilen'gth and ha voports 26,126 at}theends -,of--=said; ,p0r on entering the internalbloreof l c tweenthes e portsa poirt fi n- I nects, the-cutaway 'portionit x- I Near: each-en i 11161301 Y r i 32 which-is-pivoted to a floatinglever 33- cylinder 17 are admission and exhaustports 28, 28 whichcommunicate with ports 29,

29' in the plug 23. A pilot valve having a stem 30 and two heads 31thereon plays in the'bore of the plug andfcontrols theports 29, 29. Thestem, 30 is attached to a block fulcrumed. at one end to an arm 34 onanextension 35- ofthe piston rod 14 of the ,such "as a piston 38 attachedto the rod 36.

, justled. A pipe 42 from the extraction stage (mth1s case the first)conveys the stage pressure to one side of the piston 38 and.

A. helical spring 39. abuts at one end against a shoulder on the casingand at theother end against a. collar 40 on the 'rod 36. A- nut 41meshes with screw threads on said rod and. bears against the collar. Byrotating said nut, the tension of the spring can be adtends to move itin a. direction opposite to that in'wl ich the spring 39 biases it. Fromthe space on the other side of said piston a pipe 43 runs to thecondenser conduit 6,.

of steam in the first stage 4 of the turbine The operation is asfollows: The tension of the spring 39 is adjusted by the nut 41' so thatit will balance the desired pressure from which steam is extractedthrough the outlet 3 for industrial purposes. Now suppose the demand forsuch steam lessens. The stage ressure rises, the abutment 38 -moves' (tot e right in Fig. 3), compresses the spring 39, and forces the lever 33and the pilotvalve to the right thereby uncovering the ports 29 and 28an admitting steam frornthe pipe 21 to the right hand end of thecylinder 17: This drives the piston 16 tothe leftand pulls the annularvalve-.wider open, so that a larger quantity of steam can overflowfrom'stage 4: to stage 5 and thus reduce the abnormal pressure instag-e4. In

opening the ports 29 to steam the pilot valve connects the ports 28, 29with the port 26,

the cutaway portion 25, port 27 and exhaust pipe 22. The movement ofthepiston is communicated by the'rod 35, arm 34: andlever 33 to thepilot valve, drawing the latter back to its mid position and therebycutting off the supply of steam to the cylinder 17, and lockingthe-piston'16 in its new position. It will thus be seen that the parts33, 34; and 35 form afollow-up device. If

the pilot valve has not moved very far, the piston '16 will be arrestedbefore it has shifted very much from itsformer position.

If it should move to the end of its stroke,

it will close the port 28' before it arrives at the end of the cylinder,so that a body of steam is trapped between the-piston and the cylinderhead and cushions the piston, preventing it from slamming. An increasethe demand for industrial steam will produce an opposite efiect, causingthe motor to partly or wholly close theoverfiow valve in order" toretain the steam in stage 4 and keep up its pressure.

In accordance with the provisions of the patent statutes, I havedescribed the principle of operation of my invention, toget er with theapparatus which I now consid r to represent the. bestembodiment-thereof; but I desire to have it understood that theapparatus-shown is only illustrative, and that the invention can becarried out by other means.

Whatl claim as new-and desire to se-' 1. The combination iwi-th amultistage turbine, of a conduit -for,e'xtracting steam from a stage ofhigher pressure, an annular overflow valve between said stage and theone next lower, a motor tor-opening and closing said valve, andmeans-responsive t0 the steam pressure in said extraction'stage forcontrolling said motor for the purpose of maintaining constantpressurein said stage.

2. The combination with a multistage. turbine, of a gridiron overflowvalve be tween stages, a motor for operating said .valve, a pilot valvecontrolling said motor,

a movable abutment for actuating the pilot valve and exposed. to ahigher stagepressure, a spring opposing said pressure on said abutment,and a pipe opening out of said higher stage for supplying steam forindustrial purposes.

cure by Letters Patent of the United States, Y

3. The combination with a multistage turbine, of an annular valverevoluble on a diaphragm and controlling the flow of steam to a lowerstage, a motor for operating said valve, apilot valve for said motor,

apipe connected to a stage of higher pressure through which steam flows,and a device responsive to variationsin steampres sure in said stage ofhighenpressure for,

controlling said pilot valve.

4. The combination with a multistage turbine, of a conduit for steamconnected to a stage of higher pressure, an annular valve controllingports between said stage and the next lower, a piston motor foractuating said valve, :1 pilot valve. controlling. sai motor, a pistonworking in.a cylinder and exposed to the pressurein said-higher stage, aspring opposing said pressure, and a floating lever pivotally connectedto the piston pilot valve stem and the movable element of the motor.

5. The combination with a multistage turbine, of an annular gridironvalve revolubly mounted on a diaphragm between two stages andcontrolling the flow of steam to the nozzles of the 'nextlow'er stage, aconduit extracting steam for industrial pur- *weim poses from the higherstage,and. means re 1 spons'ive to.the pressure in saidhigher stage foropening and 'closingsaid-valver t-herotor-o'f lower pressiire, a motor,a connection between the movable part.0f theif 6 A turbine comprisingacasing that is dlvided by a' diaphragm into stages of differentpressures,.rotors for the stages, de-' avconduit'extracting steam fromthe stage of higher pressn-re,' a' valve' that controls a numberof-thenOZZies admitting steam to motor and the "valve, a pilo'tvalve forthe motor, anda device responsive to the pressure in the extractionstage for moving thepiiot valve. v I

r 7. The combination with: a multistage' turbine, of-a conduit forextracting steam from a stage of higher-pressure, an overflow val'vebetween said stage and the next lower," a motor for operating. saidvalve} having a. piston and piston rod, a lever pi'v:

otally connected to the piston rod, a pilot valve for said motor havingits stem pivoted to said 1ever,.a1'1d a movable abutment piv-' otallyiconnected to .the end of said lever and responsive to variationsinsteam pres 7 sure in the extraction; stage.

j .8wThe combination with .a multistage turbine; of a -eonduitforextracting steam I V from 'a' stage of. higher pressure, an over-' vces admitting-steam to the said rotors,"

flow valve between said .stage and the next lower, a motorfor operatingsaid valve "having a piston and piston rod, an extension of said rodpassing through the head of the motor cylinder, anarm on saidextension,- a leverfulcrumed on said arm, a pilot valve for the motor'having it's stem pivotall'y connected to said lever, a movable abutmentpivotall-y connected to the end of said lever and e'Xpose'dto the steampressure in the extraction stage,' and yielding means for opposing saidpressure. I In witness whereof, 'I have hereunto set my hand this ninthdayof January, 1913.

' FRED E. NORTON.

I Witnesses:

JOHN A. MoMAN-Us, Jr.,

' JAMES I. MINKLER.

